Tridopsis tridentata, Eastern North America. Both genus and species names refer to the three barriers ("teeth') in the shell aperture (not visible here). These barriers keep potential predators out of the shell when the snail is retracted.
Life Stages And Gender
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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Burch, J.2004. "092.rjb1.jpg" (On-line), Animal Diversity Web. Accessed May 28, 2023 at https://animaldiversity.org/collections/contributors/jack_burch/092.rjb1/
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